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Диаграмма_классов__classes__.plantuml

+@startuml
+left to right direction
+
+class User {
+  +id: int
+  +username: string
+  +email: string
+  +passwordHash: string
+  +createdAt: DateTime
+}
+
+class UserProfile {
+  +userId: int
+  +progressLevel: int
+  +experiencePoints: int
+  +lastActive: DateTime
+}
+
+class AuthService {
+  +login(email: string, password: string): bool
+  +signUp(username: string, email: string, password: string): User
+  +resetPassword(email: string): void
+}
+
+class Exercise {
+  +id: int
+  +title: string
+  +difficulty: string
+  +startExercise(): void
+  +submitAnswer(answer: string): bool
+}
+
+class VocabularyExercise {
+  +word: string
+  +translation: string
+}
+
+class GrammarExercise {
+  +rule: string
+  +examples: string[]
+}
+
+class LearningMaterial {
+  +id: int
+  +title: string
+  +description: string
+}
+
+class VideoMaterial {
+  +videoUrl: string
+  +duration: int
+}
+
+class TextMaterial {
+  +content: string
+}
+
+class Achievement {
+  +id: int
+  +name: string
+  +description: string
+  +condition: string
+  +isUnlocked: bool
+}
+
+class AchievementSystem {
+  +checkProgress(userId: int): void
+  +unlockAchievement(userId: int, achievementId: int): void
+}
+
+User "1" -- "1" UserProfile : has >
+User "1" -- "*" Achievement : unlocks >
+User --> AuthService : authenticates via
+Exercise <|-- VocabularyExercise
+Exercise <|-- GrammarExercise
+LearningMaterial <|-- VideoMaterial
+LearningMaterial <|-- TextMaterial
+Exercise "1" -- "*" LearningMaterial : uses >
+UserProfile "1" -- "*" Exercise : completes >
+AchievementSystem --> User : checks
+AchievementSystem --> Achievement : manages
+
+@enduml
\ No newline at end of file